Once
"Once" in Japanese
かつて
katsute
(formerly)
一回
ikkai
(one and only one time)
一度
ichido
(one and only one time)
一時
ichiji
(formerly)
一時期
ichijiki
(formerly)
一遍
ippen
(one and only one time)
以前
izen
(formerly)
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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.